Buggy code:
, new double [ ] { 2 , 3 , 4 } } ; protected double [ ] [ ] subRows31Cols31 = new double [ ] [ ] { new double [ ] { 7 , 5 } , new double [ ] { 4.5 , 2.5 } } ; protected double [ ] [ ] subRows01Cols23 = new double [ ] [ ] { new double [ ] { 3 , 4 } , new double [ ] { 3.5 , 4.5 } } ; protected double [ ] [ ] subRows23Cols00 = new double [ ] [ ] { new double [ ] { 2 } , new double [ ] { 4 } } ; protected double [ ] [ ] subRows00Cols33 = new double [ ] [ ] { new double [ ] { 4 } } ; protected double [ ] [ ] subRow0 = new double [ ] [ ] { new double [ ] { 1 , 2 , 3 , 4 } } ; protected double [ ] [ ] subRow3 = new double [ ] [ ] { new double [ ] { 4 , 5 , 6 , 7 } } ; protected double [ ] [ ] subColumn1 = new double [ ] [ ] { new double [ ] { 2 } , new double [ ] { 2.5 } , new double [ ] { 4 } , new double [ ] { 5 } } ; protected double [ ] [ ] subColumn3 = new double [ ] [ ] { new double [ ] { 4 } , new double [ ] { 4.5 } , new double [ ] { 8 } , new double [ ] { 7 } } ; protected double entryTolerance = 1.0E-15 ; protected double normTolerance = 1.0E-13 ; public RealMatrixImplTest ( String name ) { } public void setUp ( ) { } public static Test suite ( ) { } public void testDimensions ( ) { } public void testCopyFunctions ( ) { } public void testAdd ( ) { } public void testAddFail ( ) { } public void testNorm ( ) { } public void testPlusMinus ( ) { } public void testMultiply ( ) { } private double [ ] [ ] d3 = new double [ ] [ ] { new double [ ] { 1 , 2 , 3 , 4 } , new double [ ] { 5 , 6 , 7 , 8 } } ; private double [ ] [ ] d4 = new double [ ] [ ] { new double [ ] { 1 } , new double [ ] { 2 } , new double [ ] { 3 } , new double [ ] { 4 } } ; private double [ ] [ ] d5 = new double [ ] [ ] { new double [ ] { 30 } , new double [ ] { 70 } } ; public void testMultiply2 ( ) { } public void testTrace ( ) { } public void testScalarAdd ( ) { } public void testOperate ( ) { } public void testMath209 ( ) { } public void testTranspose ( ) { } public void testPremultiplyVector ( ) { } public void testPremultiply ( ) { } public void testGetVectors ( ) { } public void testGetEntry ( ) { } public void testExamples ( ) { } public void testSubMatrix ( ) { } public void testGetRowMatrix ( ) { } public void testGetColumnMatrix ( ) { } public void testGetRowVector ( ) { } public void testGetColumnVector ( ) { } private RealVector columnToVector ( double [ ] [ ] column ) { } public void testEqualsAndHashCode ( ) { } public void testToString ( ) { } public void testSetSubMatrix ( ) throws Exception { } protected void assertClose ( String msg , RealMatrix m , RealMatrix n , double tolerance ) { } protected void assertClose ( String msg , double [ ] m , double [ ] n , double tolerance ) { } protected void splitLU ( RealMatrix lu , double [ ] [ ] lowerData , double [ ] [ ] upperData ) throws InvalidMatrixException { if ( ( ( ( ( ! ( lu . isSquare ( ) ) ) || ( ( lowerData . length ) != ( lowerData [ 0 ] . length ) ) ) || ( ( upperData . length ) != ( upperData [ 0 ] . length ) ) ) || ( ( lowerData . length ) != ( upperData . length ) ) ) || ( ( lowerData . length ) != ( lu . getRowDimension ( ) ) ) ) { <START_BUG> throw new InvalidMatrixException ( "incorrect<seq2seq4repair_space>dimensions" , new Object [ 0 ] ) ; <END_BUG> } int n = lu . getRowDimension ( ) ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( j < i ) { lowerData [ i ] [ j ] = lu . getEntry ( i , j ) ; upperData [ i ] [ j ] = 0.0 ; } else if ( i == j ) { lowerData [ i ] [ j ] = 1.0 ; upperData [ i ] [ j ] = lu . getEntry ( i , j ) ; } else { lowerData [ i ] [ j ] = 0.0 ; upperData [ i ] [ j ] = lu . getEntry ( i , j ) ; } } } } protected RealMatrix permuteRows ( RealMatrix matrix , int [ ] permutation ) { } }

Fix:
throw new InvalidMatrixException ( "incorrect<seq2seq4repair_space>dimensions" , null ) ;